Microchip MCP73831 Single Cell Li-Ion Charge Controller SOT-23, 4.2V, 500mA

The Microchip MCP73831T-2ATI/OT is a highly advanced linear charge management controller designed for space-limited portable applications. Its compact SOT-23-5 package and minimal external component requirement make it ideal for modern compact devices.

Engineered for USB-powered charging, this controller fully complies with USB power bus specifications. It utilises a constant current/constant voltage (CC/CV) charging algorithm with selectable preconditioning and charge termination. The constant current value is easily set with a single external resistor, and the device delivers a programmable charge current from 15mA to 500mA.

Key safety and reliability features include integrated pass transistor, integrated current sensing, and reverse discharge protection. The high-accuracy preset voltage regulation of +0.75% ensures precise 4.2V charging for single-cell Li-Ion or Li-Polymer batteries. Thermal regulation optimises the charge cycle while maintaining device reliability, even under high power or high ambient conditions.

Specifications:

• Battery Type: Li-Ion, Li-Polymer
• Input Voltage: 6V
• Battery Charge Voltage: 4.2V
• Charge Current: Programmable up to 500mA
• Package: SOT-23-5
• Pins: 5
• Number of Cells: 1
• Operating Temperature: -40°C to +85°C
• Mounting: Surface Mount
• Product Range: MCP73831, MCP73832

The controller also features selectable preconditioning, selectable end-of-charge control, tri-state output, and automatic power down, making it a versatile and reliable solution for efficient battery management in portable electronics.